The in vivo rates of catabolism of 14C-labelled pentylamine, ethylamine, putrescine, and cadaverine were studied in thyroidectomized rats and others made hyperthyroid by the daily administration of 0.2 mg of L-thyroxine per kilogram for 20--21 days. Hyperthyroid rats metabolized the monoamines at an accelerated rate; thyroidectomized animals oxidized pentylamine at a reduced rate. There was no effect of hypophysectomy on the rate of pentylamine oxidation. The in vitro monoamine oxidase (MAO) activity of liver was reduced in hyperthyroid rats and unchanged in those thyroidectomized; MAO activity in skeletal muscle was increased in the hyperthyroid rats and decreased in the hypothyroid rats. Because of the large mass of skeletal muscle compared with liver, it is considered that the changes in muscle MAO could play an important role in determining the rate of oxidation of pentylamine in vivo. The oxidation of the two diamines tested was not significantly affected by thyroidectomy; the rates were increased in the hyperthyroid rats, but the increase was significant only for cadaverine.
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